In this task, you are given a context and four options. Each option is a suggested ending for the context. You should read the context and pick the best ending for the context. Please answer with "A", "B", "C", and "D". 

Ex Input:
[header] How to study the phenomenon of light as a nonequilbirum state of matter [title] Understand how thermodynamic systems are categorized. [step] Thermodynamic systems in nature are divided into two types. One is systems that are at equilibrium state with the environment and the other is systems that are in a state of nonequilibrium with the surroundings. <sep> (A) On earth, nature has a preference for systems that are at an equilibrium state with the surrounding. This is so due to the principle of minimum energy that every object in the universe aspires to have. (B) For example, gas rising in temperature throughout the day can be divided into microorganisms in the environment. [substeps] For example, gas rising in temperature in the atmosphere can be divided into molecules in the environment. (C) [substeps] Equilibrium is fundamental in thermodynamics. Other systems include stars, planets, and oceans. (D) [title] Learn about the term " rock hydrodynamics ". [step] Rock hydrodynamics refers to the transfer of water to the earth's surface.

Ex Output:
A


Ex Input:
[header] How to reduce calories in coffee drinks [title] Use a low calorie sweetener. [step] Replace teaspoons of sugar added directly into your coffee with a low calorie or no-calorie sweetener, such as splenda. Follow the directions on the package regarding serving size and resist the urge to add extra. <sep> (A) You can also request this substitution when ordering at a coffee shop. [substeps] It is best to choose sweeteners that do not list " aspartame " as one of the ingredients. (B) Sweet drinks containing no sweetener limit should do the same. [substeps] Four servings for a half-ounce glass of coffee will give you seven servings. (C) Sugar-sweetened coffee drinks can cause you to feel full and merry, as they add less calories to your coffee and save you time and energy. It's best to avoid this throughout the day. (D) Typically, this amount of sugar is equivalent to a light sized shake, but it could be less to add to a light, calorie-heavy shake. [title] Drink more juice, if at all.

Ex Output:
A


Ex Input:
[header] How to protect your land rights [title] Build walls and fences. [step] A wall or fence along the border of your property is one of the simplest ways to keep other people out, as well as putting would-be intruders on notice that the land within is private property. [substeps] If you live in a suburban community, make sure the type of fence you want to build is allowed before you begin construction. <sep> (A) Often these prohibitions apply to businesses or potential visitors. However, it's not a reflection of a position of property and cattle or sheep are more likely to deter potential visitors. (B) You also may want to have a survey done to establish the exact boundaries of your property as set forth in your deed. Talk to any adjoining property owners before you construct a fence or a wall. (C) This will ensure that no one can use your property as a defense against the intruders. However, you should also be cautious about building fences in this way. (D) This will help keep people from cutting into the land so people don't damage your property, and also gain some control over the process. Protect your garden from water and the spread of disease.

Ex Output:

B


